diff --git a/wagtailcharts/templatetags/wagtailcharts_tags.py b/wagtailcharts/templatetags/wagtailcharts_tags.py
index b1d95a6..58e4dea 100644
--- a/wagtailcharts/templatetags/wagtailcharts_tags.py
+++ b/wagtailcharts/templatetags/wagtailcharts_tags.py
@@ -3,9 +3,9 @@
 
 register = template.Library()
 
-@register.simple_tag(takes_context=True)
-def render_charts(context):
-    return render_to_string('wagtailcharts/tags/render_charts.html', context=context)
+@register.simple_tag
+def render_charts():
+    return render_to_string('wagtailcharts/tags/render_charts.html')
 
 @register.filter()
 def addspace(val):